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The biggest remaining race for the Democratic presidential nominee doesn't involve any state primaries. Now it's about wooing superdelegates, including six party leaders from Utah.

Five of Utah's superdelegates have already endorsed a candidate and they weren't budging Wednesday despite the results of Tuesday's primaries in North Carolina and Indiana that slightly increased Barack Obama's lead on Hillary Clinton.

Utah's sixth superdelegate is Rep. Jim Matheson, who like many of the remaining 265 party leaders, plans to sit tight until after the last primary on June 3.

"I'm withholding my decision until all 50 states are done," he said.

There are just 217 pledged delegates to be chosen in the final six primaries, and neither candidate can win enough to claim the party's nomination, adding importance to the decisions of the superdelegates.

Obama picked up four more superdelegates Wednesday, while Clinton claimed two more.

Both candidates have support among Utah's superdelegates. Utah Democratic Chairman Wayne Holland and former U.S. Rep. Bill Orton have endorsed Obama, citing his big win in the state primary and his ability to energize new voters. Obama will also have the support of an as-yet-unnamed superdelegate that Holland will select at the state convention on Saturday.

Clinton has the backing of Utah Democratic Committeewoman Helen Langan and former state Sen. Karen Hale, although they have said they are giving Obama's campaign a second look after his victory in the state primary in early February. Langan said Wednesday that she is remaining a Clinton supporter.

"If I say anything different, it will be after the primaries," Langan said.

Although Obama padded his delegate lead in Tuesday's primaries, most uncommitted superdelegates want to remain on the sidelines. The Associated Press interviewed more than 70 undeclared superdelegates or their representatives Wednesday, and many said they don't want to get involved until the voting ends on June 3.

However, the comments of some of the uncommitted superdelegates were anything but encouraging for Clinton.

''I'm just wondering about the viability of Clinton's campaign at this point,'' said Laurie Weahkee, an add-on delegate from New Mexico. ''I really want to hear from her more about if she wants to stay in the race - if the reason remains very concrete.''

Pennsylvania Rep. Mike Doyle said Clinton's pitch to superdelegates has been that she can win the popular vote, but that was undercut when Obama netted more than 200,000 popular votes in the Tuesday contests.

''The math just got very tough for her after last night,'' Doyle said. ''I think most of us out of respect for her are content to wait a little longer. . . . The absolute best way for this to end is for the candidates to end it, not the superdelegates. That's the ending we all dream about every night.''

Clinton picked up two in the wake of Tuesday's loss in North Carolina and narrow victory in Indiana. North Carolina Rep. Heath Shuler had said he would support the winner of his district, and Clinton won it handily. A spokeswoman for Texas labor leader Robert Martinez told the AP he is committed to Clinton, but it wasn't clear when he made the decision.

But Virginia state House member Jennifer McClellan switched her support to Obama. McClellan is one of at least nine superdelegates who have switched from Clinton to Obama since the Super Tuesday primaries on Feb. 5. There have been no public switches in the other direction.

''I think the time has come to support Senator Obama as the likely nominee,'' McClellan said in a conference call with reporters. ''Given what happened last night, it's very unlikely we will have a different result, and it is time to come together as a party and prepare for victory against John McCain in November.''

Obama also got the support of North Carolina Democratic Party Chairman Jerry Meek, North Carolina Democratic National Committee member Jeanette Council and California DNC member Inola Henry.

Clinton met with undecided superdelegates at Democratic Party headquarters Wednesday. She said, ''We talked a lot about Florida and Michigan,'' two states that she won but don't have any delegates to count toward her total because their early primaries violated party rules. ''I continue to emphasize and stress that we cannot disenfranchise those voters.''

Obama was to make his pitch to the congressional fence sitters in meetings Thursday. He also planned to start traveling to swing states to signal that the general election has begun.

Superdelegates who are supporting Obama have given a number of reasons. They recognize he is the front-runner and want to end a divisive party fight.

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* Tribune reporter MATT CANHAM contributed to this story.